Tim Gan Math
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Tim Gan Math Original

Using standard sums, show that \(\sum_{r=1}^{n}r(r+1)=\frac{n(n+1)(n+2)}3\).[4]

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Answer:\(\sum_{r=1}^{n}r(r+1)=\frac{n(n+1)(n+2)}3\) (shown).

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